This common name refers to only one family.
These are pretty much always called Inchworms.
These terrestrial (Terrestrial: Insects which live on land and are fed on by trout only when they incidentally fall into the water are known as "terrestrials" to fly anglers, and they're very important in late summer.) moths are sometimes taken by trout when their larvae, the well-known inchworms, dangle by their little silken threads in especially high numbers around June. They may be abundant enough throughout the forest that plenty dangle their way into the water.
Geometridae (Inchworms) Moth Larva
View 6 PicturesI caught this inchworm lowering itself to the surface of a trout stream from its silk thread. I saw a couple others floating on the surface, so it's likely the trout were familiar with them.
Collected May 29, 2007
from in Added to Troutnut.com by on June 4, 2007